Multiple-tap switch



H. F. CHRISTIE MULTIPLE TAP SWITCH May 15,1928. 1,670,189

Filed June 11, 1926 ff y! A Inventor Patented May 15, 1928. i l UNITED STATES PATENT' OFFCF...

y HENRY F.'CHRISTIE, OF EDMONTON, ALBERTA, CANADA..

MULTIPLE-TAP sWI'rcn.V

Application led June 11, 1926. Serial No. 115,377.

The present invention pertains to aA novel Figure 9 is a Wiring diagram. multiple tap switch designed to control the Reference to these views will now be made use of electrical and radio apparatus. by use of like characters which are ein- The principal object of the invention is ployed to designate corresponding parts et the provision of a device of this character throughout.

which eliminates the dead endlosses that ref The device comprises a stationary base sult in the present method of tappingin- Comprising a board or panel l lhaving a ductance coils, cylinder 2 secured to the lower or rear face This object is accomplished by dividing. thereof. The cylinder is maintained in this ai 10 the induction coil into a series of units, each position by means of bolts 3 passed'through having a pair of leads, ,and providing` a ears 4 and into the base, but obviouslyY the switch which will place any desirednumber parts are not thus joineduntil the assembly' of units in series and connect them tothe Within the cylinder has been completed. apparatus, the remaining units being discon'- A shaft or spindle 5 is passed through the 'fo In' nected, The Switch consists 'essentially ef e4 cylinder and panel and is fitted cxteriorly stationary base carrying pairs of fixed con; of the panel with a dial 6 yprovided 'with atactg, and e movable 'portion carrying conturning knob 7. The dial and knob are '.tacts positionedin a manner to connect the locked to the Spindle by moans of a set members 0f the pairs. of fixed contacts. screw 8. The panel l carries a pointer or' 72S These movable contacts are legs 'by one in similar device (not shown) for co-operating number than the pairs of fixed contacts. With thodial (i. l s0 thatat all times the members 0f one of The has@ O1 end Wall 0f the Cylinder/2 i the pairs of fixed contacts are disconnected, is formed with `aboss 9 surroundingy the The leads fromthe coil units vare connected Spindle. Upon this boss is mounted a disc e te the lfixed contacts, and the unite epe lO which 'constitutes the movable part of placed in Series' by ineens of the movablev the switch. For convenience, a shoulder `ll contacts as far es' the pair'of disconnected is formed'in the iwall of the cylinder for xed'contacts. One of the members of this aiding in 'the support of the disc. hc disc pajris engaged by a leading Contact carried {llSO 1S formed With il bOSS l2 and iS Secured 35 by the disc9 and a Suitable device is 'P1-O to vthe spindle by means of a forked key 14 vided for joining the leading Contact te passed through the boss and spindle. The

the apparatus under control, ends of the fork prongs are split as at l5 This devicecons'ists preferably of la wipand finally spread against the surface of the ing brush carriedl by the disc, joined to the boss 12 as shown 1n Figure 2. no leading Contact, and in permanent engagc-` Within the cylinder 2 is mounted a uumment with a contactring secured to the base. her of spaced Contacts arranged in pairs so From this ring is extended a bindingipost or that two circular series are formed as shown terminal for enabling connectionto the ap- 111 Flgure 4. Each rContact member is paratus. stamped from a blank of metal in to the es 40 The invention is, .fully disclosed in the shape shown in Figure 6. Thevarious parts following description and in the accomofeach Contact are a binding post 1G, a body1 panying drawings in which; 17 lying in the wall of the cylinder. lugs 15 Figure l is a diametrical section of the and 19 extending in opposite directions and apparatus; engaging the faces of the wall, an angular loo Figure 2 is a` plan view of the stationary portion 20 and finally the contact end 2l.

cylinder; The contacts are inserted in such a manner Figure 8 is a plan view of the dial; that the inclined portions 2O of opposed Figure 4 is a section on the line 4 4 of members converge upwardly to form a Figure l; spring clip 105 Figure 5 is a perspective view of the The rotatable member l0 carries a circu-v spring stop; lar series of contacts 22 receivable between igure 6 is a perspective viewfof one of the members of the pairs of fixed fontacts as the contact members; shown in Figure l. The movable contacts Figure 7 is a detail section; are less by one in number than the pairs of 110 Figure 8 is a perspective view of the fixed contacts7 so that in any adjustment of forked key; and the device the members of one of the pairs of fixed Contacts are disconnected. For this rel maining pair the disc carries a leading Contact 23 adapted to engage only one of the members of this pairpthe cylinder is surrounded by a contacty ring 24 secured' to` the bottom or end wall of the cylinder bya numing vcontact 27 permanently engagingthe.

- ring' and connected to the leading contact 23 by a link 28. f

rThe switch is-designedl to control an induction coil divided into a number of units 29 by :connecting the vleads 30 thereof to the mum` angle through which this memberls pairs of fixed contacts the members of each pair are connected to leads of adjacent unitsas shown in Figure 9. Any desired number of units` may be tapped by yadjustment `of the knob 7.' The circuit. is broken at the pair of contacts containing the leading contact 23, but the units in advance ofthe leading contact are joined in series byv the movable contacts 22. "One of the fixed contacts -adjacent the leading rcontact 23 is connected to the apparatus through the link v "28, wiping contact 27, ring 26 v 24 and terminal In order to maintain themovable member 10 in any adjusted position, spring stops 31 are secured tothe cylinder 2 'for reception in dents 32 ormed in the edge of the movable member as shown in Figure 2. Movement of the stationary member is limited byk a pin 33 carried therebyV and engageable against. a stop 34 formedin the bottom ofthe cylinder 2 as'shown in Figure 7 The stud 33 may be adjusted with reference to the mov able member 1() in order to define the maxipermitted to turn.

While a specific embodiment of the inven-` tion has been illustrated and described, it. is to be understood that various yalterations in the details of construction may be made without depart-ing from the spirit of the invention as indicated by the 'appended claims.

in such a manner lthat i devices connected to the lbe connected in series and asingle leading cont-act adapted to engage4 only one of any of said'fixed contacts and ahead of lthe single` Having thus fully described the invention, what I claim as new anddesire to protect by Letters Patentl is:

l. A multiple tap switchk comprising a fixed base and a movable portion, pairs of :contacts secured to the base in a circular series, single lcontacts carried by the movable portion and adapted to bridge the lower pairs of contacts, and a single leading contac-t adapted to engage only one contact of any pair whereby both connections of any apparatus connected to the switch and ahead of the leading contact are completely disconnected from those already actuated by the switch behind said leading contact.

Y2. A multiple t-ap switch comprising a fixedbase, a movable element rotatable there in, pairs of contacts secured to the base ina circular series, single bridging contacts carried bythe movable portion and adapted to bridge'the pairs of fixed contacts independently of each other whereby the electrical fixed contactswill contact whereby the remaining apparatus connected tothe switch their leads disconnected 4from the rest of the devices. y

3. multiple tap switch comprising a fixed base and a Arotatable disc mounted therein, pairs of `contacts secured to .said base, single contacts adapted to connect the members of said pairs, said single contactsbeing less by. one

in number than said pairs, a leading contact carried by` said only one of themembers of said pairs, a conducting ring fixed to said base, a wiping con` tact carried by the disc and engaging said ring, an electrical connection between said wiping contact and leading contact, and a conducting member extending from said ring.V

Y In witness whereof I have hereunto set my hand.

HENRY r. CHRISTIE.

carried by said disc andv will have both of d disc and adapted to engagek v 

